Effects of Preheat on Weldments of NICOP Steel.

Abstract

Shielded metal arc weldments of Armco Steel Corporation's NICOP class 3, 19mm (3/4 inch) plate, conforming to ASTM A710 grade A, were studied to provide information concerning the microstructure in the heat affected zone (HAZ) of weldments fabricated with and without preheat. Microhardness, scanning electron microscopy and transmission electron microscopy were used to determine the effect of preheating on the microstructure. Similar microstructures in the preheat and non-preheat samples were observed. The microstructures were polygonal and acicular ferrite in the base and base/HAZ regions and increasing amounts of bainite and auto tempered martensite islands near the fusion line. From the point of view of microstructure, NICOP appears to be weldable without preheating.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1983
Accession Number
ADA137145

Entities

People

  • R. F. Burna

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Alloys
  • Chemistry
  • Electron Microscopes
  • Electron Microscopy
  • Hardness
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Microhardness
  • Microscopes
  • Microscopy
  • Notch Toughness
  • Scanning Electron Microscopy
  • Solid Solutions
  • Steel
  • Transmission Electron Microscopy
  • Welds

Fields of Study

  • Materials science

Readers

  • Metallurgy

Technology Areas

  • Microelectronics